It appears that someone is using my account and I'm getting an absurd amount of emails confirming signing up for things and nothing in my sent. I've updated my privacy settings and changed my password but things are still showing up. How can I eliminate this issue immediately?

If someone is using your email address just to subscribe you or signup you up for various services, there is not much you can do about it. It doesn’t mean your account is/was hacked.
– AlexJan 30 at 16:00